Piston And Connecting Rod - Perkins UA Workshop Manual

4

Piston and connecting rod

To dismantle and to assemble the early type
Cautions:
l The big-end bolts are fitted to the connecting rod by a special process and must not be removed. If the bolts
are removed, the connecting rod, and the bolts will be damaged.
l Early type connecting rods must not be mixed in the engine with the fracture split connecting rods. In this
situation, a complete set of four fracture split connecting rods must be fitted.
Notes:
l The pistons and connecting rods are matched to the relevant cylinder (A1/A2). Note the position of each
connecting rod and piston for correct assembly.
l The bore of the early type gudgeon pin has changed from tapered to parallel on the latest engines. If pistons
and connecting rods are to be renewed, and they are on the same crank pin axis (ie) 1 and 4 or 2 and 3, it
is recommended that the complete set of pistons are renewed. This will prevent engine vibration due to out-
of-balance forces.
UA & UC ENGINES
58
This document has been printed from SPI². Not for Resale
UB ENGINES
2
Workshop Manual, TPD 1392E, issue 3
700 Series
Operation 4-3
1
Continued